发明名称 |
PROCESS FOR THE GAS-PHASE POLYMERIZATION OF OLEFINS |
摘要 |
<p>Process for the gas-phase polymerization of olefins of the formula CH2=CHR in which R is hydrogen or an alkyl or aryl radical with 1 to 8 carbon atoms carried out in one or more reactors having a fluidized or mechanically agitated bed, using a catalyst obtained by reaction of a titanium halide or haloalcoholate and optionally an electron-donor compound supported on an active Mg dihalide with an Al-trialkyl compound and optionally an electron-donor compound, comprising the steps of: a) contacting the catalyst components in the absence of the olefin; b) prepolymerizing propylene or mixtures of propylene with minor amounts of ethylene or an alpha-olefin to form a propylene polymer with an insolubility in xylene of at least 60% by weight, in an amount of from 0.5 to 1000 g per g solid catalyst component; and c) polymerizing one or more CH2=CHR olefins in the gas phase in the presence of the prepolymer-catalyst system obtained in b) while maintaining in the gas phase an alkane in a molar concentration with respect to the olefin of from 20 to 80%.</p> |
申请公布号 |
GR3020753(T3) |
申请公布日期 |
1996.11.30 |
申请号 |
GR19960401974T |
申请日期 |
1996.08.08 |
申请人 |
MONTELL NORTH AMERICA INC.;MONTELL TECHNOLOGY COMPANY BV |
发明人 |
COVEZZI, MASSIMO;GALLI, PAOLO;GOVONI, GABRIELE;RINALDO, ROBERTO |
分类号 |
C08F2/34;C08F4/60;C08F4/642;C08F4/654;C08F10/00;C08F210/16;(IPC1-7):C08F10/00 |
主分类号 |
C08F2/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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